NMP 7.4v 2Amp Battery Packs

[gene.maurice at comcast.net]

Adam
I think that if you were to put a fairly fast amp meter in the power circuit on an all digital plane, you'll find the peak draws MUCH higher than 1 amp. A local guy has an EagleTree system in an all digital plane (sample response time is only about 1/10 of a second, pretty slow) and it shows AVERAGES of 1.0 - 2.0 amps with peaks up in the 3 - 4 amp range. These peaks are very short in duration but require a battery capable of delivering that sort of amperage none the less.
Digital servos draw large amounts of current when asked to move, especially under aerodynamic loads. In addition, their holding power will draw as much current as it takes, or is available, to maintain a position. 
Check it out, I think you'll be surprised.  
--
Gene Maurice 
AMA 3408 NSRCA 877 
Plano, TX 
gene.maurice at comcast.net


-------------- Original message -------------- 

> Dieter Rozek wrote: 
> 
> > I just purchase these battery packs and according to the included 
> > instructions is mentions to "Only use NMP's Lithium charger to charge 
> > these packs." I was wondering if anyone might know why this would be 
> > the case. Shouldn't any Li battery charger work? I already have a 
> > Kokam Li battery charger which allows me to charge at various rates. 
> > Is there a legitimate reason why I should buy their charger or should 
> > any Li charger work? Also, I was surprised at the diminutive size of 
> > the pack. Does this pack have enough juice to power 3x JR9411, 1x3412 
> > and 1x8411 in a Temptation? At 2A I would assume that this would be 
> > more than plenty? I would be interested in hearing anyone's 
> > experience with these packs. 
> > 
> > Thanks 
> > 
> > DIeter 
> > 
> > ===================================== 
> > # To be removed from this list, go to 
> > http://www.nsrca.org/discussionA.htm 
> > and follow the instructions. 
> > 
> I'm estimating our peak draw with a fully digital plane is around 1amp, 
> so any lithium battery over 250mah shouldn't have a problem staying 
> above 6.0v during those draws. 
> ===================================== 
> # To be removed from this list, go to http://www.nsrca.org/discussionA.htm 
> and follow the instructions. 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20040825/4ee2b965/attachment.html